It seems that the exchanging of SIGUSR1 and SIGUSR2 [1] in s6-linux-init did not happen. Is it just forgotten, or ...?
[1] <http://skarnet.org/cgi-bin/archive.cgi? 1:mss:597:201510:fhcdfkgclcolibfmenil>. -- My current OpenPGP key: RSA4096/0x227E8CAAB7AA186C (expires: 2020.10.19) 7077 7781 B859 5166 AE07 0286 227E 8CAA B7AA 186C